Railroad brake-shoe.



I. A'. GIBBS. RAILROAD BRAKE SHOE.

APPLICATION FILED APR. 29. 1908.

Patented NOV. 10, 1908.

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UNITED STATES PATENT FMQE.

ISAAC A. GIBBS, OF ROANOKE, VIRGINIA, ASSIGNOR OF ONE-HALF TO JOHN ROSE, OF

ROANOKE, VIRGINIA.

RAILROAD BRAKE-SHOE.

Specification of Letters Patent.

Patented Nov. 10, 1908.

Application filed April 29, 1908. Serial No. 430,009.

To all whom it may concern:

Be it known that I, ISAAC A. GIBBS, a citizen of the United States, residing at Roanoke, in thecounty of Roanoke and State of Virginia, have invented certain new and useful Improvements in Railroad Brake- Shoes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful improvements in railroad brake-shoes, and particularly to that type shown and described in an application for Letters Patent filed by me September 17, 1907, Serial No. 393,273, in which the brake-shoe is formed with a conduit in its face for the delivery of sand from the sand-dome of an engine to the track immediately in front of the driving wheels.

My present invention has for its object to provide such a shoe with a sand delivery trough vibratively located within the recess or groove in the face of the shoe and adapted to be held in contact with the tread of the driving wheel regardless of the position of the brake-shoe, and which shall be capable of having its delivery end extended below the lower extremity of the brake-shoe and terminating close to the track-rail and under the tread of the driving wheel.

With these ends in view my invention consists in the details of construction and arrangement hereinafter and more fully set forth.

In order that those skilled in the art to which my invention appertains may know how to make and use my invention and appreciate all of the advantages, I will proceed to describe the same referring to the accompanying drawings, in which Figure 1 is a detail side elevation of the forward wheel of a locomotive upon a rail, with my improved brake-shoe and connection leading to the sand-dome (the latter not shown), and showing the brakeshoe out of contact with the wheel. Fig. 2 is a similar view showing the brake-shoe in braking contact with the wheel. Fig. 3 is a horizontal section on the line (4-?) of Fig. 1, and Fig. 4 is a side elevation in partial section on the line cd of Fig. 3.

Similar numerals represent like parts in the several figures of the drawing.

1, is the brake-shoe secured to the brakebeam, by means of the ordinary pivoted brake-head 3, and bolt t.

The brake-shoe 1, is formed with a brake surface 5, adapted to contact with the tread of the wheel outside of the rail 6, and with a groove 7, adapted to contact with the flange 8, of the wheel 9. Intermediate the brake surface 5, and the groove 7, is a recess 10, all as shown and described in the application hereinbefore referred to, and as therein described the brake-shoe is connected by suitable means with the sanddome of the locomotive.

11, is a sand trough or conduit open in the rear, which is located within the vertical recess 10, of the brake-shoe and sustained therein by a hook 12, or in any other suitable vibrative manner.

13, is preferably a fiat spring having one end fixed to the shoe 1, and its free end bearing against the vibrative trough or con duit in such manner as to hold the same in light frictional contact with the tread of the wheel regardless of the position of the brake-shoe, in order that it may be kept sufficiently warm to insure the ready flow of the sand flowing therethrough from the sand-dome to insure the delivery of the sand to the rail immediately in front of, and adjacent to the wheel. To secure the delivery of the sand to this locality the sand trough or conduit 11, is extended below the terminus of the brake-shoe as clearly shown and may thus more nearly approach the rail than would be possible in the case of the sand delivery shoe described in the application hereinbefore referred to, and consequently the sand may not only be delivered more nearly to the contact between the wheel and the rail, but more certainly upon the rail on sharp curves. The said trough or conduit 11, is preferably composed of sheet steel of about one-eighth inch gage and is reinforced at its open edges by a strengthening strip 14., of about half inch width secured in place by rivets 15, thus increasing its contact surface with the wheel ancl adding strength to the structure. The sand conduit or trough 11, communicates with the sand-dome by any suitable connection 16, but as this forms no part of my present invention such connection is referred to in general terms only.

While I have shown the trough or conduit 11, as vibratively connected with the brakeshoe by means of a hook at the upper end and as being held in contact with the tread of the wheel by a fiat spring secured at its upper end to the brake-shoe, I do not wish to be confined to these details of construction for the reason, that other means may be employed for vibratively connecting the trough or conduit with the brake-shoe, and any other form of spring may be employed for holding the trough or conduit in contact with the wheel without departing from the spirit of my invention which resides in the broad idea of a vibrative sand conduit or trough located within a vertical recess in the face of the brake-shoe, and adapted to be held in contact with the tread of the wheel of a locomotive in such manner as to insure the delivery of sand from the sand-dome of a locomotive to the track immediately in front of, and adjacent to the wheel.

From the construction shown and described it will be seen that while the brakeshoe 1, is free to be brought into braking contact with the wheel and to be released therefrom, that the sand trough or conduit 11, when the brake-shoe is in braking position may act as an auxiliary thereto, it remains in slight frictional contact with the wheel when the brake-shoe is released, thus securing at all times the necessary frictional heat to facilitate the gravitation or flow of the sand which however may be induced by any other means such as that shown and described in a copending application by me Serial No. 393,273.

Having described the construction, operation and advantages of my improvements,

which I claim as new and desire to secure by Letters Patent is 1. A railway brake-shoe for locomotives comprising in its construction a vertical recess or groove in its braking face and having located therein a spring actuated vibrative sand conduit communicating with the sanddome of a locomotive and terminating at its delivery end in front of and adjacent to the driving wheel thereof, substantially as and for the purpose hereinbefore set forth.

2. In a brake-shoe for locomotives, a sand trough or conduit vibratively located within a vertical recess or groove in the face thereof, pivoted at its upper end to the brakeshoe, and a spring interposed between the brake-shoe and the sand trough ,or conduit, substantially as and for the purpose set forth.

3. In a brake shoe such as described, a sand trough vibratively located within the brake face of said shoe, and having its free edges reinforced, substantially as and for the purpose set forth.

4. In a brake-shoe provided with a recess in its brake face, an open sided sand trough or conduit vibratively located therein and terminating below the brake-shoe in front of, and immediately adjacent to the drive wheel of a locomotive, substantially as hereinbefore set forth.

5. In combination with a locomotive and the sand-dome thereof, a brake-shoe having a recessed brake face, and a sand conduit vibratively located therein and communicating with the sand-dome, substantially as hereinbefore set forth.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

ISAAC A. GIBBS.

Witnesses:

LAWRENCE S. DAVIS, P. H. MINER. 

